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Requirements and Cost of Producing Market Milk in Northwestern Indiana
Jesse Burdette BainRutherford Jay Posson
出版U.S. Department of Agriculture, 1920
URLhttp://books.google.com.hk/books?id=Oe30D2AU6f8C&hl=&source=gbs_api
EBookFULL_PUBLIC_DOMAIN
註釋Statement of costs for the two years, by seasons. pp. 10.